// @ts-ignore
const { $, dom } = Cypress

describe('src/cypress/dom/visibility', {
  slowTestThreshold: 500,
}, () => {
  function assertVisibilityForEl (el: HTMLElement) {
    // once experimentalFastVisibility is added, switch based on the config value
    // and use `cy-fast-expect` instead of `cy-legacy-expect` when it is enabled.
    const expected = el.getAttribute('cy-expect') ?? el.getAttribute('cy-legacy-expect')

    if (!expected) {
      throw new Error(`Expected attribute 'cy-expect' or 'cy-legacy-expect' not found on test case_ element ${el.outerHTML}`)
    }

    expect(
      $(el).is(`:${expected}`),
      `${el.getAttribute('cy-label') ?? el.textContent ?? 'empty text content'} should be ${expected}`,
    ).to.be.true

    expect(el).to.be[expected]

    cy.wrap(el).should(`be.${expected}`)

    const opposite = expected === 'hidden' ? 'visible' : 'hidden'

    expect(
      $(el).is(`:${opposite}`),
      `${el.getAttribute('cy-label') ?? el.textContent ?? 'empty text content'} should not be ${opposite}`,
    ).to.be.false

    expect(el).to.not.be[opposite]

    cy.wrap(el).should(`not.be.${opposite}`)
  }

  function prepareFixtureSection (section: string) {
    cy.get('.test-section').each((el) => el.removeClass('active'))
    cy.get(`[cy-section="${section}"]`).then((el) => el.addClass('active'))
    cy.get(`[cy-section="${section}"]`).scrollIntoView()
  }

  function assertVisibilityForSections (sections: string[]) {
    for (const section of sections) {
      it(`detects visibility for ${section} test cases`, () => {
        prepareFixtureSection(section)
        cy.get(`[cy-section="${section}"] .testCase`).then((els) => {
          els.get().forEach(assertVisibilityForEl)
        })
      })
    }
  }

  beforeEach(() => {
    cy.visit('/fixtures/generic.html')
  })

  context('isHidden', () => {
    it('exposes isHidden', () => {
      expect(dom.isHidden).to.be.a('function')
    })

    it('throws when not passed a DOM element', () => {
      const fn = () => {
        dom.isHidden(null!)
      }

      expect(fn).to.throw('`Cypress.dom.isHidden()` failed because it requires a DOM element. The subject received was: `null`')
    })
  })

  context('isVisible', () => {
    it('exposes isVisible', () => {
      expect(dom.isVisible).to.be.a('function')
    })

    it('throws when not passed a DOM element', () => {
      const fn = () => {
        // @ts-ignore
        dom.isVisible('form')
      }

      expect(fn).to.throw('`Cypress.dom.isVisible()` failed because it requires a DOM element. The subject received was: `form`')
    })
  })

  context('#isScrollable', () => {
    beforeEach(function () {
      this.add = (el) => {
        return $(el).appendTo(cy.$$('body'))
      }
    })

    it('returns true if window and body > window height', function () {
      this.add('<div style="height: 1000px; width: 10px;" />')
      const win = cy.state('window')

      const fn = () => {
        return dom.isScrollable(win)
      }

      expect(fn()).to.be.true
    })

    it('returns false if window and body < window height', () => {
      cy.$$('body').html('<div>foo</div>')

      const win = cy.state('window')

      const fn = () => {
        return dom.isScrollable(win)
      }

      expect(fn()).to.be.false
    })

    it('returns true if document element and body > window height', function () {
      this.add('<div style="height: 1000px; width: 10px;" />')
      const documentElement = Cypress.dom.wrap(cy.state('document').documentElement)

      const fn = () => {
        return dom.isScrollable(documentElement)
      }

      expect(fn()).to.be.true
    })

    it('returns false if document element and body < window height', () => {
      cy.$$('body').html('<div>foo</div>')

      const documentElement = Cypress.dom.wrap(cy.state('document').documentElement)

      const fn = () => {
        return dom.isScrollable(documentElement)
      }

      expect(fn()).to.be.false
    })

    it('returns false el is not scrollable', function () {
      const noScroll = this.add(`\
<div style="height: 100px; overflow: auto;">
  <div>No Scroll</div>
</div>\
`)

      const fn = () => {
        return dom.isScrollable(noScroll)
      }

      expect(fn()).to.be.false
    })

    it('returns false el has no overflow', function () {
      const noOverflow = this.add(`\
<div style="height: 100px; width: 100px; border: 1px solid green;">
  <div style="height: 150px;">
    No Overflow Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Aenean lacinia bibendum nulla sed consectetur. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Etiam porta sem malesuada magna mollis euismod.
  </div>
</div>\
`)

      const fn = () => {
        return dom.isScrollable(noOverflow)
      }

      expect(fn()).to.be.false
    })

    it('returns true when vertically scrollable', function () {
      const vertScrollable = this.add(`\
<div style="height: 100px; width: 100px; overflow: auto;">
  <div style="height: 150px;">Vertical Scroll</div>
</div>\
`)

      const fn = () => {
        return dom.isScrollable(vertScrollable)
      }

      expect(fn()).to.be.true
    })

    it('returns true when horizontal scrollable', function () {
      const horizScrollable = this.add(`\
<div style="height: 100px; width: 100px; overflow: auto; ">
  <div style="height: 150px;">Horizontal Scroll</div>
</div>\
`)

      const fn = () => {
        return dom.isScrollable(horizScrollable)
      }

      expect(fn()).to.be.true
    })

    it('returns true when overflow scroll forced and content larger', function () {
      const forcedScroll = this.add(`\
<div style="height: 100px; width: 100px; overflow: scroll; border: 1px solid yellow;">
  <div style="height: 300px; width: 300px;">Forced Scroll</div>
</div>\
`)

      const fn = () => {
        return dom.isScrollable(forcedScroll)
      }

      expect(fn()).to.be.true
    })
  })

  describe('visibility scenarios', () => {
    describe('html and body overrides', () => {
      beforeEach(() => {
        cy.visit('/fixtures/empty.html')
      })

      describe('when display none', () => {
        beforeEach(() => {
          cy.get('html').then(($el) => {
            $el.css('display', 'none')
          })

          cy.get('body').then(($el) => {
            $el.css('display', 'none')
          })
        })

        it('is always visible', () => {
          expect(cy.$$('html').is(':hidden')).to.be.false
          expect(cy.$$('html').is(':visible')).to.be.true

          expect(cy.$$('html')).not.to.be.hidden
          expect(cy.$$('html')).to.be.visible

          cy.wrap(cy.$$('html')).should('not.be.hidden')
          cy.wrap(cy.$$('html')).should('be.visible')
          expect(cy.$$('body').is(':hidden')).to.be.false
          expect(cy.$$('body').is(':visible')).to.be.true

          expect(cy.$$('body')).not.to.be.hidden
          expect(cy.$$('body')).to.be.visible

          cy.wrap(cy.$$('body')).should('not.be.hidden')
          cy.wrap(cy.$$('body')).should('be.visible')
        })
      })

      describe('when not display none', () => {
        it('is visible', () => {
          expect(cy.$$('html').is(':hidden')).to.be.false
          expect(cy.$$('html').is(':visible')).to.be.true

          expect(cy.$$('html')).not.to.be.hidden
          expect(cy.$$('html')).to.be.visible

          cy.wrap(cy.$$('html')).should('not.be.hidden')
          cy.wrap(cy.$$('html')).should('be.visible')
          expect(cy.$$('body').is(':hidden')).to.be.false
          expect(cy.$$('body').is(':visible')).to.be.true

          expect(cy.$$('body')).not.to.be.hidden
          expect(cy.$$('body')).to.be.visible

          cy.wrap(cy.$$('body')).should('not.be.hidden')
          cy.wrap(cy.$$('body')).should('be.visible')
        })
      })
    })

    describe('basic CSS properties', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/basic-css-properties.html')
      })

      assertVisibilityForSections([
        'visibility-property',
        'display-property',
        'opacity-property',
        'input-elements',
        'table-elements',
        'box-interactions',
      ])
    })

    describe('form elements', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/form-elements.html')
      })

      assertVisibilityForSections([
        'select-and-option-elements',
        'optgroup-elements',
        'options-outside-select',
        'hidden-options-within-visible-select',
        'input-elements',
      ])
    })

    describe('overflow', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/overflow.html')
      })

      assertVisibilityForSections([
        'zero-dimensions-with-overflow-hidden',
        'text-content-with-zero-dimensions',
        'positive-dimensions-with-overflow-hidden',
        'overflow-auto-with-zero-dimensions',
        'mixed-dimension-scenarios',
        'overflow-hidden',
        'overflow-y-hidden',
        'overflow-x-hidden',
        'overflow-auto-scenarios',
        'overflow-scroll-scenarios',
        'overflow-relative-positioning',
        'overflow-flex-container',
        'overflow-complex-scenarios',
        'clip-path-scenarios',
      ])
    })

    describe('positioning', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/positioning.html')
      })

      assertVisibilityForSections([
        'position-fixed-element-covered-by-another',
        'static-ancestor-fixed-descendant',
        'static-parent-fixed-child',
        'positioning-with-zero-dimensions',
        'fixed-positioning-with-zero-dimensions',
        'position-absolute-scenarios',
        'position-sticky-scenarios',
      ])
    })

    describe('transforms', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/transforms.html')
      })

      assertVisibilityForSections([
        'scaling',
        'translation',
        'rotation',
        'skew',
        'matrix',
        'perspective',
        'multiple',
        'multiple-3d',
        'backface-visibility',
      ])
    })
  })

  context('#getReasonIsHidden', () => {
    const reasonIs = ($el: JQuery, str: string) => {
      expect(dom.getReasonIsHidden($el)).to.eq(str)
    }

    describe('basic css / box model', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/basic-css-properties.html')
      })

      it('has `display: none`', function () {
        prepareFixtureSection('display-property')
        cy.get('[cy-section="display-property"] .testCase[cy-expect="hidden"]:first').then(($el) => {
          reasonIs($el, 'This element `<div.testCase>` is not visible because it has CSS property: `display: none`')
        })
      })

      it('has a parent with `display: none`', function () {
        cy.visit('/fixtures/visibility/basic-css-properties.html')
        prepareFixtureSection('display-property')
        cy.get('[cy-section="display-property"] .testCase[cy-expect="hidden"] span').then(($el) => {
          reasonIs($el, 'This element `<span.testCase>` is not visible because its parent `<div.testCase>` has CSS property: `display: none`')
        })
      })

      it('has `visibility: hidden`', function () {
        prepareFixtureSection('visibility-property')
        cy.get('[cy-section="visibility-property"] .testCase[cy-expect="hidden"]').then((el) => {
          reasonIs($(el).first(), 'This element `<div.testCase>` is not visible because it has CSS property: `visibility: hidden`')
        })
      })

      it('has parent with `visibility: hidden`', function () {
        prepareFixtureSection('visibility-property')
        cy.get('[cy-section="visibility-property"] .testCase[cy-expect="hidden"] button').then((el) => {
          reasonIs($(el).first(), 'This element `<button.testCase>` is not visible because its parent `<div.testCase>` has CSS property: `visibility: hidden`')
        })
      })

      it('has `visibility: collapse`', function () {
        prepareFixtureSection('table-elements')
        cy.get('[cy-section="table-elements"] td[style*="visibility: collapse"]').then(($el) => {
          reasonIs($el, 'This element `<td.testCase>` is not visible because it has CSS property: `visibility: collapse`')
        })
      })

      it('has parent with `visibility: collapse`', function () {
        prepareFixtureSection('table-elements')
        cy.get('[cy-section="table-elements"] tr[style*="visibility: collapse"] td').then(($el) => {
          reasonIs($el, 'This element `<td.testCase>` is not visible because its parent `<tr.testCase>` has CSS property: `visibility: collapse`')
        })
      })

      it('has `opacity: 0`', function () {
        prepareFixtureSection('opacity-property')
        cy.get('[cy-section="opacity-property"] .testCase[cy-expect="hidden"]').then(($el) => {
          reasonIs($($el).first(), 'This element `<div.testCase>` is not visible because it has CSS property: `opacity: 0`')
        })
      })

      it('has parent with `opacity: 0`', function () {
        prepareFixtureSection('opacity-property')
        cy.get('[cy-section="opacity-property"] .testCase[cy-expect="hidden"] button').then(($el) => {
          reasonIs($el, 'This element `<button.testCase>` is not visible because its parent `<div.testCase>` has CSS property: `opacity: 0`')
        })
      })
    })

    it('is detached from the DOM', function () {
      const divDetached = $('<div>Detached</div>')

      reasonIs(divDetached, 'This element `<div>` is not visible because it is detached from the DOM')
    })

    describe('overflow-related', () => {
      beforeEach(() => {
        cy.visit('/fixtures/visibility/overflow.html')
      })

      it('has effective zero width', function () {
        prepareFixtureSection('zero-dimensions-with-overflow-hidden')
        cy.get('[cy-section="zero-dimensions-with-overflow-hidden"] .testCase[cy-label="Zero width ancestor, parent, self"]').then(($el) => {
          reasonIs($el, 'This element `<div.testCase>` is not visible because it has an effective width and height of: `0 x 100` pixels.')
        })
      })

      it('has effective zero height', function () {
        prepareFixtureSection('zero-dimensions-with-overflow-hidden')
        cy.get('[cy-section="zero-dimensions-with-overflow-hidden"] .testCase[cy-label="Zero height ancestor, parent, self"]').then(($el) => {
          reasonIs($el, 'This element `<div.testCase>` is not visible because it has an effective width and height of: `100 x 0` pixels.')
        })
      })

      it('has a parent with an effective zero width and overflow: hidden', function () {
        prepareFixtureSection('zero-dimensions-with-overflow-hidden')
        cy.get('[cy-section="zero-dimensions-with-overflow-hidden"] .testCase[cy-label="Zero height ancestor, parent, self"] span').then(($el) => {
          reasonIs($el, 'This element `<span.testCase>` is not visible because its parent `<div.testCase>` has CSS property: `overflow: hidden` and an effective width and height of: `100 x 0` pixels.')
        })
      })

      it('element sits outside boundaries of parent with overflow clipping', function () {
        prepareFixtureSection('overflow-hidden')
        cy.get('[cy-section="overflow-hidden"] .testCase[cy-label="Element out of bounds right"]').then(($el) => {
          reasonIs($el, 'This element `<div.testCase>` is not visible because its content is being clipped by one of its parent elements, which has a CSS property of overflow: `hidden`, `clip`, `scroll` or `auto`')
        })
      })
    })

    it('is hidden because it is backface', function () {
      cy.visit('/fixtures/visibility/transforms.html')
      prepareFixtureSection('backface-visibility')
      cy.get('[cy-section="backface-visibility"] .testCase[cy-label="RotateX 180deg with hidden backface"]').then(($el) => {
        reasonIs($el, 'This element `<div.testCase>` is not visible because it is rotated and its backface is hidden.')
      })
    })

    it('is hidden by transform', function () {
      cy.visit('/fixtures/visibility/transforms.html')
      prepareFixtureSection('scaling')
      cy.get('[cy-section="scaling"] .testCase[cy-label="ScaleX to zero"]').then(($el) => {
        reasonIs($el, 'This element `<div.testCase>` is not visible because it is hidden by transform.')
      })
    })

    it('element is fixed and being covered', function () {
      cy.visit('/fixtures/visibility/positioning.html')
      prepareFixtureSection('position-fixed-element-covered-by-another')
      cy.get('[cy-section="position-fixed-element-covered-by-another"] .testCase[cy-label="Fixed positioned element covered by another"]').then(($el) => {
        reasonIs($el, 'This element `<div.testCase>` is not visible because it has CSS property: `position: fixed` and it\'s being covered by another element:\n\n`<div class="testCase" cy-expect="visible" cy-label="Element covering fixed positioned element" style="position: fixed; bottom: 0; left: 0; background: lightskyblue; width: 100px; height: 100px;">on top</div>`')
      })
    })

    it('needs scroll', function () {
      cy.visit('/fixtures/visibility/empty.html')
      const el = cy.$$('body').append(`
          <div style="position: fixed; top: 0; right: 0; bottom: 0; left: 0; overflow-x: hidden; overflow-y: auto;">
            <div style="height: 800px">Big Element</div>
            <button id="needsScroll">MyButton</button>
          </div>
        `)

      reasonIs(el.find('#needsScroll'), `This element \`<button#needsScroll>\` is not visible because its ancestor has \`position: fixed\` CSS property and it is overflowed by other elements. How about scrolling to the element with \`cy.scrollIntoView()\`?`)
    })

    it('cannot determine why element is not visible', function () {
      // this element is actually visible
      // but used here as an example that does not match any of the above
      const visible = cy.$$('<div>Visible</div>')

      cy.$$('body').append(visible)
      reasonIs(visible, 'This element `<div>` is not visible.')
    })
  })
})
